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Unify undo_ep_move(m)

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Integrate undo_ep_move in undo_move() this reduces line count
and code readibility.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-08-16 17:58:24 +01:00
parent b4cb1a3a9e
commit 05e70d6740
2 changed files with 20 additions and 62 deletions
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81
src/position.cpp
View file

@ -742,9 +742,9 @@ void Position::do_move(Move m, StateInfo& newSt, Bitboard dcCandidates) {
assert(!(ep || pm) || piece == piece_of_color_and_type(us, PAWN));
assert(!pm || relative_rank(us, to) == RANK_8);
st->capture = type_of_piece_on(to);
st->capture = ep ? PAWN : type_of_piece_on(to);
if (st->capture || ep)
if (st->capture)
do_capture_move(st->capture, them, to, ep);
// Update hash key
@ -892,7 +892,6 @@ void Position::do_capture_move(PieceType capture, Color them, Square to, bool ep
if (ep)
{
capture = PAWN;
capsq = (them == BLACK)? (to - DELTA_N) : (to - DELTA_S);
assert(to == st->epSquare);
@ -1042,14 +1041,13 @@ void Position::undo_move(Move m) {
if (move_is_castle(m))
undo_castle_move(m);
else if (move_is_ep(m))
undo_ep_move(m);
else
{
Color us = side_to_move();
Color them = opposite_color(us);
Square from = move_from(m);
Square to = move_to(m);
bool ep = move_is_ep(m);
bool pm = move_is_promotion(m);
PieceType piece = type_of_piece_on(to);
@ -1057,6 +1055,9 @@ void Position::undo_move(Move m) {
assert(square_is_empty(from));
assert(color_of_piece_on(to) == us);
assert(!pm || relative_rank(us, to) == RANK_8);
assert(!ep || to == st->previous->epSquare);
assert(!ep || relative_rank(us, to) == RANK_6);
assert(!ep || piece_on(to) == piece_of_color_and_type(us, PAWN));
if (pm)
{
@ -1088,6 +1089,7 @@ void Position::undo_move(Move m) {
do_move_bb(&(byTypeBB[piece]), move_bb);
do_move_bb(&(byTypeBB[0]), move_bb); // HACK: byTypeBB[0] == occupied squares
board[from] = piece_of_color_and_type(us, piece);
board[to] = EMPTY;
// If the moving piece was a king, update the king square
if (piece == KING)
@ -1099,22 +1101,27 @@ void Position::undo_move(Move m) {
if (st->capture)
{
Square capsq = to;
if (ep)
capsq = (us == WHITE)? (to - DELTA_N) : (to - DELTA_S);
assert(st->capture != KING);
assert(!ep || square_is_empty(capsq));
// Restore the captured piece
set_bit(&(byColorBB[them]), to);
set_bit(&(byTypeBB[st->capture]), to);
set_bit(&(byTypeBB[0]), to);
board[to] = piece_of_color_and_type(them, st->capture);
set_bit(&(byColorBB[them]), capsq);
set_bit(&(byTypeBB[st->capture]), capsq);
set_bit(&(byTypeBB[0]), capsq);
board[capsq] = piece_of_color_and_type(them, st->capture);
// Update piece list
pieceList[them][st->capture][pieceCount[them][st->capture]] = to;
index[to] = pieceCount[them][st->capture];
pieceList[them][st->capture][pieceCount[them][st->capture]] = capsq;
index[capsq] = pieceCount[them][st->capture];
// Update piece count
pieceCount[them][st->capture]++;
} else
board[to] = EMPTY;
}
}
// Finally point our state pointer back to the previous state
@ -1185,54 +1192,6 @@ void Position::undo_castle_move(Move m) {
}
/// Position::undo_ep_move() is a private method used to unmake an en passant
/// capture. It is called from the main Position::undo_move function.
void Position::undo_ep_move(Move m) {
assert(move_is_ok(m));
assert(move_is_ep(m));
// When we have arrived here, some work has already been done by
// Position::undo_move. In particular, the side to move has been switched,
// so the code below is correct.
Color us = side_to_move();
Color them = opposite_color(us);
Square from = move_from(m);
Square to = move_to(m);
Square capsq = (us == WHITE)? (to - DELTA_N) : (to - DELTA_S);
assert(to == st->previous->epSquare);
assert(relative_rank(us, to) == RANK_6);
assert(piece_on(to) == piece_of_color_and_type(us, PAWN));
assert(piece_on(from) == EMPTY);
assert(piece_on(capsq) == EMPTY);
// Restore captured pawn
set_bit(&(byColorBB[them]), capsq);
set_bit(&(byTypeBB[PAWN]), capsq);
set_bit(&(byTypeBB[0]), capsq);
board[capsq] = piece_of_color_and_type(them, PAWN);
// Move capturing pawn back to source square
Bitboard move_bb = make_move_bb(to, from);
do_move_bb(&(byColorBB[us]), move_bb);
do_move_bb(&(byTypeBB[PAWN]), move_bb);
do_move_bb(&(byTypeBB[0]), move_bb);
board[to] = EMPTY;
board[from] = piece_of_color_and_type(us, PAWN);
// Update piece list
pieceList[us][PAWN][index[to]] = from;
index[from] = index[to];
pieceList[them][PAWN][pieceCount[them][PAWN]] = capsq;
index[capsq] = pieceCount[them][PAWN];
// Update piece count
pieceCount[them][PAWN]++;
}
/// Position::do_null_move makes() a "null move": It switches the side to move
/// and updates the hash key without executing any move on the board.

1
src/position.h
View file

@ -313,7 +313,6 @@ private:
void do_capture_move(PieceType capture, Color them, Square to, bool ep);
void do_castle_move(Move m);
void undo_castle_move(Move m);
void undo_ep_move(Move m);
void find_checkers();
template<PieceType Piece>